The SPI-MEMS example, its not great but it does use the SPI

port and can tell you the temperature of the room you are in.

examples/stm32/f4/stm32f4-disco/spi/clock.h

@@ -0,0 +1,15 @@
+/*
+ * This include file describes the functions exported by clock.c
+ */
+#ifndef __CLOCK_H
+#define __CLOCK_H
+
+/*
+ * Definitions for functions being abstracted out
+ */
+void msleep(uint32_t);
+uint32_t mtime(void);
+void clock_setup(void);
+
+#endif /* generic header protector */
+